Re: [foxboro] CALCULATING CHANGE IN VALUE
- From: "Badura, Tom" <tbadura@xxxxxxxxxx>
- To: "foxboro@xxxxxxxxxxxxx" <foxboro@xxxxxxxxxxxxx>
- Date: Thu, 1 Aug 2013 22:12:12 +0000
Richard
Getting back to you on the off subject topic. We are a batch operation and we
do run a one-week annual maintenance shutdown where we clean pipelines,
reactors, vessels and tanks; service boilers and power house, etc. We
mechanically safe all processes so it does give us the opportunity to take down
at least portions of the DCS to clean and service workstations, do software
upgrades, and the like. We do disconnect all power from the plant for one
afternoon to service substations and switchgear at which point we do an orderly
shutdown of the entire DCS. I know most of the continuous process people out
there don't have it nearly so easy.
Tom Badura
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] On
Behalf Of Richard Peck
Sent: Friday, July 26, 2013 8:58 PM
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] CALCULATING CHANGE IN VALUE
Hi Tom,
Off topic - you take down the whole DCS once a year?
What maintenance are you doing?
Richard.
On 26 July 2013 06:00, Badura, Tom <tbadura@xxxxxxxxxx> wrote:
> Rakesh,
> Real quick off the top of my head something like this in a CALC block
> should work. I'd give it a try, but our whole system is down for
> annual maintenance.
>
> Tom Badura
> Plastics Engineering Company
> tbadura@xxxxxxxxxx
>
>
> IN M01; One-Shot Toggle
> DON M02; 2 Min Delay M02=120
> OUT M01;
> BIF xx; IF Delay Time
> IN RI01; Current Value
> SUB M03; - Previous Value
> OUT RO01; = Difference
> IN RI01; Current Value
> OUT M03; = Previous Value
> xx END;
>
> -----Original Message-----
> From: foxboro-bounce@xxxxxxxxxxxxx
> [mailto:foxboro-bounce@xxxxxxxxxxxxx]
> On Behalf Of RAKESH DASH
> Sent: Thursday, July 25, 2013 12:36 PM
> To: foxboro@xxxxxxxxxxxxx
> Subject: [foxboro] CALCULATING CHANGE IN VALUE
>
> Hi,
> I want to make a calculation where the result would be the subtraction
> of current real value and value of the signal 2 minute before. How to do that
> ?
> how to capture the value 2 minute before ?
> Using IACC.
>
> Thanks in advance.
>
> Regards,
> Rakesh
>
>
>
>
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>
> ______________________________________________________________________
> _ This mailing list is neither sponsored nor endorsed by Invensys
> Process Systems (formerly The Foxboro Company). Use the info you
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_______________________________________________________________________
This mailing list is neither sponsored nor endorsed by Invensys Process Systems
(formerly The Foxboro Company). Use the info you obtain here at your own risks.
Read http://www.thecassandraproject.org/disclaimer.html
foxboro mailing list: //www.freelists.org/list/foxboro
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_______________________________________________________________________
This mailing list is neither sponsored nor endorsed by Invensys Process
Systems (formerly The Foxboro Company). Use the info you obtain here at
your own risks. Read http://www.thecassandraproject.org/disclaimer.html
foxboro mailing list: //www.freelists.org/list/foxboro
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